diff --git a/library/x509_crt.c b/library/x509_crt.c
index 5919303..b7d1036 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -2271,7 +2271,7 @@
     p = buf;
     n = size;
 
-    mbedtls_platform_memset( &sig_info, 0, sizeof( mbedtls_x509_crt_sig_info ) );
+    memset( &sig_info, 0, sizeof( mbedtls_x509_crt_sig_info ) );
     mbedtls_pk_init( &pk );
 
     if( NULL == crt )